Unigraphics

Once the part or assembly is created in 3D and is in positive space:
  1. File > Export > Rapid Prototyping
  2. Set Output type to Binary
  3. Set Triangle Tolerance to 0.0025
  4. Set Adjacency Tolerance to 0.12
  5. Set Auto Normal Gen to On
  6. Set Normal Display to Off
  7. Set Triangle Display to On

For additional questions refer to your manual, MIS department or the Maker of the software: Siemens

Select your CAD program in the pulldown menu to view the recommended settings for exporting an STL file